Pipe-wrench



(No Model.)

messes PIPE WRENCH.

P. FOSTER.

Patented Apr. 13, 1886. :E5-.1.

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N. FTEHS. FhMD-Uwugmphxr, Washington. D. C.

V 'in Uiriin Starts lh-treni. @trice DAX P. FOS'IE H, OF XVA'LTH AM, MASSACHUSETTS.

PIPE-WRENCH.

SPBCIPCATIONvJrming part of Letters Patent No. 339.634, dated April 13, 1886.

Application filed August i7, Seri-.il No. 1T-l,l`16-`. (No modem To zZ- whom it may con/cern:

Be it known that l, DAN P. Fosrnn. a citizen of the United States, residing at vValtham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Nut and Pipe W'renches; and I do declare that the same are fully described in the following specification and illustrated in the accompanying drawings.

rlhis invention relates to improvements in nut and pipe wrenches, and it is carried out as follows, reference being had to the accompanying drawings, where- Figure l represents a side elevation, and Fig. 2 represents alongitudinal section, of the improved wrench. Fig. 3 represents a crosssection on the line A B, shown in Fig. l.

Similar letters refer to similar part-s wherever they occur on the different parts of the drawings.

In the dra-wings, u is the stationary jaw,with its shank a and handle a, and b is the movable jaw with its screw-threaded 'shank b', as usual. 'Both oli said jaws may be made plain or serrated, according to the use for which the wrench is intended.

To the rear o' the stationary jaw u. is rigidly secured, or made in one piece with it, the slotted guide c for the shank b' of the movable jaw b, as shown in Figs. l and 2. The rear ot' the stationary jaw (L has a downwardly-projecting `fulcrnin edge or projection, c, against which the correspondingly grooved washer b is brought to bear as the screw-threaded shank b is moved upward by nieans ol" the serrated th umh-nut b3, which latter surrounds the shank b in the same manner as shown and described in the United States Letters Patent granted to me July 3l., 1883, No. 282,298.

the screw-threaded shank b', I employ a laterally-adjustable guide, d, through which the shank b passes loosely, as shown in Figs. 2 and 3. Said guide d has a slotted perforation, d',

through which passes the stationary shank a', as shown. The guide d terminates in front of the shank a as a downwardly projecting thumb-piece, d. (Shown in Figs. l and 2.) The serrated nut b is confined between the under side oi' the washer b and upper side ofthe guide d, as shown.

To prevent the guide r1 from dropping down- For the purpose of guiding the lower end of i ward on the stationary shank a', l secure to it in a suitable manner the upper end of an elastio metallic bar, e, the lower end of which is secured by means of a set-screw, c', to the rear of shank a, as shown in Figs. l and 2, and for the purpose of properly regnlatingtheposition of the guide d relative to nut b3 when putting the wrench part-s together,0r for adjusting such parts when worn, l provide the lower end of the elastic bar e with a slot-hole, e", through which the set-screw e passes, and by this arrangement the vertical adjustment of the guide d on the shank c is easily accomplished,for the purpose set forth. The elastic bar e is so secured relative to the shank c and guide d that it will have a tendency to force the lower end of the movable shank b toward the rear ofthe shank a. when the wrench is not in use, as shown in Figs. l and 2. For the same purpose i secure to the thumb -piece d of the guide d a similar elastic bar, f, the lower end of which is adj ustably secured to the stationary shank a by means of set-screw f', passing through a slot-hole, f, in the lower end of the elastic bar as shown in Figs. l and 2. If so desired, l may dispense with this second elastic har, f, for connecting the guide d to the lower end of the shank a. The upper surface of the laterally-movable guide d is preferably made curved or arched, as shown in Fig. l, to cause the Vnut b3 to be held with proper play between the under side of washer b and top of said guide d when the wrench is not in use; but I do not wish to @online myself to any particular shape of said guide d, as this may be varied without departing from the essence of my invention.

in using my improved wrench the movable jaw b is lirst adjusted by means of turning the nut b3 so that the object to be grasped can be introduced between the jaws a and b, after which the operator presses the thumb-piece d toward the front of shank c', against the influence of the elastic bar e, (or the secondary one f,} and thereby causes the jaw b to swing on fulcrum u. until it is brought in contact with the object that is to be turned, after which the operator moves handle afin the direction shown by arrow in Fig. 1, thereby producinga firm grip on the object held between the jaws a and I). By turning the handle c in an opposite direction the grip on the object held between the IOO jaws a t will instantly he relieved, and the elasmore elastic bars secured toit and to the shank tic bar e will cause thegnide d and movable a', substantially in a manner and for the purjaw b to be returned to their normal positions. pose set forth. 2O (Shown in Figs. land 2.) 3. In a nut or pipe Wrench, the stationary 5 What I wish to secure by Letters Patent and shank a', having stationary upper guide, c, and claim ismovable lower guide, d, provided with one or l. The herein-described nut or pipe wrench, more elastic connecting bars secured to the consisting of stationary jaw and shank a a', said guide d and shank a, and made vertically 25 having the fulorurn a3 and stationary guide c, adjustable on the latter, as and for the purpose zo and movable jaw and shank bb', having washer set forth.

b and nut b3, in combination with the lower In testimony whereof I have affixed my signlovable guide, d, having one or two elastic nature in presence of two Witnesses. bars secured to it and to the shank a as and for the purpose set forth. 7 DAN P' FOSTER r 5 2. In a'nut or pipe Wrench, the stationary Witnesses:

shank a', having stationary upper guide, o, an d ALBAN ANDRN, movable lower guide, d, provided with one or HENRY CHADBOURN. 

